FAQ on characteristics and application of System Three's marine topcoat
WR-LPU can be recoated without sanding within 24 hours. After 24 hours, sand with 220-320 grit paper.
When rolling and tipping, best results are achieved by applying no more than 2 coats per day. Allow minimally, 4-6 hours of dry time before recoating. This timeframe allows the WR-LPU to develop water and chemical resistance. When the next coat is applied, much better flow and level occur. You will also see an improvement in wet edge extension (more open time).
Recoating in the 1-3 hour window is not advised because WR-LPU has not developed sufficient water and chemical resistance. Poor application characteristics such as reduced flow and level as well as decreased open time will result.
Sheen Variations In The Topcoat
Sheen variations and dull spots in high-gloss topcoats usually result from one of the following:
- The topcoat has been applied unevenly.
- Sandpaper used before application of the topcoat was too coarse.
- The topcoat was applied in conditions which cause it to set up prematurely. These include a substrate which is heated from the sun or where wind or ventilation is excessive.
You can avoid sheen variations by coating in an environment where the substrate is protected from the sun and wind. Additionally, sanding the substrate to 320 will provide sufficient tooth and a scratch pattern which promotes a uniform final appearance.
Dipping the brush or wetting out the roller with the topcoat charges (fills) each applicator with a given volume. This volume of topcoat has an optimal area in which to be applied. In the case of the brush, it will glide smoothly. Once it begins to drag, the volume of topcoat within the brush is depleting. Avoid further brushing. Recharge the brush, overlap into the previously applied material and dispense the topcoat.
A freshly charged roller will apply topcoat smoothly and with little noise coming from the substrate. Once the roller begins to make some surface noise, you know it's time to recharge with topcoat. Again, slightly overlap with the previously applied material. Be consistent in charging and dispensing and you will get a much more uniform sheen over the surface.
WR-LPU for pool paint or use below the waterline in general
WR-LPU is a topside paint intended primarily for above the waterline applications. It can be used below the waterline for day use watercraft only. Like with most highly-weatherable polyurethane paints, too long an exposure underwater will allow blisters to form in the film.
- How long before I can apply the WR-LPU over epoxy?
Shelf-life of System Three paints.
System Three Silvertip Yacht Primer and WR-LPU Topcoat paints are guaranteed for 3 years from the date of manufacture. However, the shelf-life can be extended if stored well sealed above 50F. After 3 years, we recommend pre-testing a small sample prior to use.
Batch code: X(YEAR) XX(MONTH) XX(DAY) X (INTERNAL CODE).
How do I thin down or lower the viscosity of the WR-LPU Topcoat?
The WR-LPU Topcoat may be thinned with clean deionized or distilled water at up to 25%.
Custom colors for WR-LPU
WR-LPU waterborne polyurethane topcoat comes in 12 standard colors. We will match any color sample you send us for an upcharge with a minimum order of 1 gallon. Small 4 oz. samples of all 12 colors are available for a nominal charge from the website. These can be intermixed in any proportions to obtain the color you want in order to have it matched.
I want to paint a design on my wood/epoxy paddleboard but I do not know what kind of paint to use or when to paint.
You can paint your design under or over the epoxy coating. If it's underneath, ordinary house paint will do. If it's on top of the resin, we would recommend our WR-LPU.